GMC Troubleshooting Questions? Ask a Mechanic for Answers
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I have seen some of the fuel injectors cause a tick noise like this here needing replaced.I have heard of being able to add a fuel conditioner to the diesel fuel as well that may smooth out the injector to clean the injector to stop the ticking.This may also be a valve lifter/tappet issue internally in the engine itself needing replaced.This will have to be checked into further to locate the cause and one of these here may be causing this as this can be common in some cases.
As for the dead battery issue check and make sure the battery cables are connected properly and are clean with no corrosion and if found o.k. the battery needs tested as well as the alternator to see if one of these are at fault needing replaced.
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